（华南理工大学土木与交通学院， 广州 510640）

［摘要］在通过足尺静力试验校核MIDAS Civil有限元模型的基础上，对一座轻钢人行桥进行动力特性分析，并采用规范ISO 10137∶2007(E)提出的单人行走荷载模型，结合用同步行走人群代替随机行走人群的方法，计算不同工况下结构峰值加速度响应。此外，考虑人群质量对人桥系统总基频的影响，将人群质量逐级折算入人桥系统总质量，分析人群行走工况下的结构加速度响应。研究认为，该桥满足现有规范对于基频的要求，同时峰值加速度基本处于德国规范EN 03规定的舒适区间，但折算78%满载人群质量计算人桥系统基频时，峰值加速度相比不折算人群质量的情况明显增大，表明人群质量可以对系统基频产生显著影响，可能造成人桥系统基频落入行人步频范围内，导致人桥共振现象的发生。

［关键词］轻钢人行桥；静力加载试验；加速度响应；人行舒适度；人群荷载模型

中图分类号：TU392-5文献标识码：A文章编号：1002-848X(2021)04-0131-05

Mechanical characteristic research and comfort evaluation of a light-weight steel footbridge

XU Jing, LI Zeyu, LI Jing, CHEN Xijun

(School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China)

Abstract:Based on the MIDAS Civil finite element model calibrated by full scale static test, the dynamic characteristics of a light-weight steel footbridge were analyzed, and the peak acceleration response of the structure under different working conditions was calculated using the single-person walking load model proposed by the code ISO 10137∶2007(E) and combining the method of replacing the random walking crowd with the synchronized walking crowd. In addition, considering the effect of the crowd mass on the natural frequency of the structural system (including the crowd and the footbridge), the crowd mass was converted into the total mass of the system step by step, and the structural acceleration response under crowd walking conditions was analyzed. The study concludes that the bridge meets the requirements of the existing code for the natural frequency and the peak acceleration is basically in the comfort zone specified in the German code EN 03. However, when the natural frequency of the system is calculated by introducing 78% of the full crowd mass, the peak acceleration is significantly higher compared to the case without considering the crowd mass, which indicates that the crowd mass may have a significant impact on the system natural frequency, and it is possible for the system natural frequency falls into the pedestrian step frequency range and leads to the resonance phenomenon.

Keywords:light-weight steel footbridge;static loading test;acceleration response;pedestrian comfort;crowd load model

*建筑——结构限制中的自由（2020A1414010101）。

作者简介：许竞，硕士研究生，Email: ctjingxu@mail.scut.edu.cn；通信作者：李静，博士，副教授，Email: cvjingli@scut.edu.cn。